Safety-valve.



M. w. Low 6 A. P HELPs.`

SAFETY VALVE.

APPLICATION FILED MAY 29. 1914.

Patented Apr. 20, 1915.

lume/Mou P H ELPS UNITED sTATEs PATENT oFFICE.

`MELVIN W. LOYD, 0F AFTON, OKLAHOMA, AND ABRAHAM PHELPS, 0F FORT SCOTT,

KANSAS.

SAFETY-VALVE.

Specification of Letters Patent.

Patenteu Apr. 2o, 1915.

To all whom it may concern.' f

Be it known that we, MELVIN W. LoYD, citizen of the- United States,residing at Afton, in the county of Ottawa and State of Oklahoma, andABRAHAM PHELPs, citizen of the United States, residing at Fort Scott,

in the county of Bourbon and State of Kanl l mounted, the valve membersbeing reciprocated by a common operating means, one of the valve membersbeing sprlng pressed and disposed within a cage detachably connected tothe inner end of the valve body, the spring pressed valve being adaptedto engage against a `seat formed on the inner extremity of the valvebody. 'j

A further object ,of this invention .isthe provision of a 1valve of thischaracter which includes two valve members, one of the valve membersbeing spring operated and'mounted in a cage connected to the inner endof the valve body and disposed within the boiler, the other valve memberbeing mounted in the body of the valve inl alinement with the valvemember in the cage to operate the same, the valve body being weakenedat'its juncture with the cageso that should the body be struck by aforeign object, the same will be broken at its weakened portion, wherebythe spring and the pressure of steam against the valve maintained withinthe cage and operable against the inner extremity of the body, will movethe valve forwardly to close the bore of the body to prevent the escapeof steam or water from the boiler. i

With these and other objects in view, our invention consists in thenovel construction, combination, and varrangement of parts to behereinafter more fully described, claimed, and illustrated in theaccompanying drawing, in which,

Figure 1 is an elevational view of our improved safety valve mounted ina boiler; Fig. 2 is a longitudinal section thereof; and Fig'. 3 is asectional view on the line 3-3 of Fig. 2.

Referring more particularly to the drawing, the numeral 1 designates thetubular body of the valve whichl is provided intermediate its lengthwith an opening 2 which leads through a discharge nozzle 3. The body isprovided at its inner end with a reduced exteriorly threaded portion 4,the body being weakened as'at 5, at the juncture of the reduced portion4 with the main portion of the body. The bore of the body is reduced andthreaded as at 6, from a point inwardly of the opening 2 in the body andthe outer extremity of the body, the inner extremity of the wall of thereduced portion of the bore forming a seat 7 for a valve member 8 whichis provided with oppositely projecting stems 9 and 10. The forwardlyprojecting stem 9 is provided with a left handed thread for a portion ofits length adjacent the valve member 8, for engagement with the threadsof the reduced portion 6 of the bore, the forward end of the forwardlyextending stem 9 projecting outwardly of the body and being angular atits extremity for engagement with an operating handle 11. When the valvemember 8 is engaged against its seat 7 in the body of the valve, theinner extremity of the inwardly extending stem 10 is disposed closelyadjacent the inner extremity of the reduced portion 4 of the body andthe inner e5(- tremity of the reduced portion 4 is beveled to form avalve seat 12.

The forwardly extending guide 13 of a valve member 14 is disposed withinthe inner end of the reduced extension 4 to engage the 19 through whichthe air or steam within the boiler may pass into the body of the valvewhen the valve members are in open position. The inner extremity of thecage is provided with a reduced tubular extenslon 2O to receive andguide the inner' extremity of the stem 15, and engaged around the stemis a helical spring 21, one end of which bears against the valve member14 and the other end of which bears against the outer end of the cage16, the spring normally forcing the valve into engagement with its seat12. The forward end'of the body is exteriorly threaded for engagementwith a packing nut 22, the packing nut preventing leakage of steam orwater from the forwardl end of the valve f body.

In the practical use of our device, our

improved valve is mounted within an opening in the locomotive boiler bythreadably engaging the threaded portion of the cage within the openingso that the ports 19 are disposed within the boiler. The forwardlyextending stem 9 of the valve member 8 is mounted within the bore of thebody 1 upon the inner end thereof, the threads on the stem 9 engagingthe threads yon the reduced portion 6 of the bore so that the forwardextremity of the stem projectsv beyond the forward end of the body forengagement with the handle 11 and the valve member 8 engages its seat 7.The valve member 14 is then engaged with the valve seat 12 formed on theinner end of the -reduced portion 4 of the body, with the guide 13engaging the inner end of the inwardly extending stem 10 of the valvemember 8, and the helical spring 21 is disposed around the Vrearwardlyextending stem 15 of the valve member 14, whereupon the reduced portion4 is engaged with the interior threads of the cage so that the forwardextremity of the cage engages the rear v'end of the body'portion of thevalve and,

in this position, the inner extremity of the valve stem 15 is engaged inthe tubular guide extension 20 of the cage. When it is desired to reducethe pressure of the steam -1 or water contained within the boiler, thevoperating handle is rotated to move ythe valve member 8 from itsseat 7,and the inwardly extending valve stem 10 simultaneously moves the'Ivalve member 14 from its seat 12, whereby the steam or water isallowedto pass through the body of the valve i. and out of the outletpipe 3 and, upon ro' tating the handle 11 in the reverse direction, thevalve member 8 is moved to its closed position against its seat 7, andthe valve member 14 is automatically forced against its seat by theaction of the spring 21. and the pressure of the steam. As the body ofthe valve projects outwardly from the steam dome (not shown), of thelocomotive boiler,l the valve is in a position to be struck by athereof, the outside body will be broken olf at the weakened portionand, by the provision of the spring pressed valve member 14 whichengages the valve seat-'12 with the inner end of the reduced portion 4,steam or water will be prevented from escaping from the boiler shouldthe valve body become broken.

It will be understood that the spring 21 is primarily adapted to holdthe valve member 14 in its seated position ywhen the boiler is cold andthat, if desired, the use of the spring may be dispensed with, asthepressureof the steam against the valve will be sufficient to close thesame should the valve be broken off at its weakened portion.

The end wall of the tubular extension 20 may accumulate between the endof the valve stem and the end wall of the extension,

may'pass into the body of the boiler so that the lodging of any sedimentwithin this extension will not prevent free working of the valve member14.

It will be understood that various valve bodies, other than shown intheaccompanying drawing, may be threaded within the outer end of thecage 16, it bein ciatedl that any alternative form o body so used inconnection with our'device, will be weakened at the juncture of the mainportion of the'body with the reduced extension hereof, so that uponengagement of the o pre erably be broken oif at the weakened portion.'

HavingA thus fully described our invention, what we desire to claim andsecure by A safety valvecomprising a hollow body, the bore of said bodybeing reduced at its forward end toA form a rearwardly facing valveseat, a discharge vent formed in the vvalve member, said body having areduced rearwardly projecting exteriorly threaded portion, the innerextremity of the reduced portion being beveled to provide a valve`-seat, the reduced portion at its juncture with the body beingweakened, a cage havwith foreign objects, the body will ing an openforward end and being provided with interior threads at its forward endfor engagement with the exterior threads of the reduced portion of thebody, said 'cage being exteriorly threaded at its forward end wherebythe cage and body may be connected in a suitable support, a

spring pressed valve carried by the cage for engagement against thevalve seat on the .In testimony whereof we hereunto aix extremity of thereduced portion of the our signatures in the presence of two wit- 10body, the last mentioned valve havin a fornesses.

wardly extending guide member or en- MELVIN W. LQYD. gagement in thereduced portion of the body, ABE PHELPS.

and a rearwardly projecting stem carried by Witnesses: the firstmentioned valve member `for en- A. E. LEWIS,

gagement against said guide member. C. W. SALMANe.

